Coulomb effects on the optical gain in semiconductor superlattices and multiquantum wells
Autor: | Yup Kim, K.-C. Seo, Koo Chul Je |
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Rok vydání: | 1999 |
Předmět: | |
Zdroj: | Journal of Applied Physics. 86:6196-6199 |
ISSN: | 1089-7550 0021-8979 |
Popis: | Based on the two-band semiconductor Bloch equations with screened Coulomb interactions, optical gains in a semiconductor superlattice and a multiquantum well are calculated to study the many-body Coulomb effects on the gains. Gain peaks, threshold density of gain and peak-gain frequencies with Coulomb effects are compared to those without Coulomb effects. The Coulomb effects are also studied by varying the carrier density and temperature. The specific Coulomb effects such as Coulomb enhancement, band filling effects, band gap renormalizations and the screening of Coulomb potential on the gain are also considered. It is found that at low temperature the Coulomb enhancement affects the optical gain sensitively, but it has little effect at high temperature. |
Databáze: | OpenAIRE |
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